Wood-sawing machine.



No. 721,680. PATENTED MAR. s, 1903.

'1'. M. DUNAGAN, JR. WOOD SAWING MACHINE.

APPLICATION FILED SEPT. 22, 1902. N0 MODEL.

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J A G A. N U D T WOOD SAWING MACHINE.

APPLICATION FILED SEPT. 22, 1902.

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UNITED STATES,

PATENT OFFICE.

' THOMAS M. DUNAGAN, JR., or NOBLE, OREGON.

WOOD-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 721,680, dated March3, 1903.

Application filed September 22, lOZ. Serial No. 124,447. (No model.) I

To (0% whom it may concern.-

Be it known that .I, THOMAS M. DUNAGAN, Jr., a citizen of the UnitedStates, residing at Noble, in the county of Marion and State of Oregon,have invented certain new and useful Improvements in Wood-SawingMachines, of which the following is a specification.

This invention has for its object to save time'and increase the workingcapacity of machines designed for sawing logs into boards, rafters, orother longitudinal parts, the purpose being to devise a machine whichwill enable the log to be cut at each forward and backward travel of.the carriage.

In accordancewith this invention two sets of saws are provided andarranged to out in opposite directions and means cooperate with the sawsto alternately advance one and withdraw the other, so that the log iscut at each advance and return movement of the carriage.

For a full description of the invention and the merits thereof and alsoto acquire a knowl-,:

edge of the details of construction of the means for effecting theresult referenceis to be had to the following description and drawingshereto attached.

While the essential and characteristic features of theinvention aresusceptible of modification, still the preferred embodiment of theinvention is illustrated in the accompanying drawings, in whichpositionof the log and carriage.

Figure 1 is a top plan view of a machine embodying the invention. Fig. 2is a transversesection on the line X X of Fig. 1 looking in thedirection of the arrows. Fig. 3 is a longitudinal section showing therelative Fig. 4 is a sectional view of a four-way valve for con trollingthe fluid medium employed for reversing the saws. Fig. 5 is adetail viewshowing the relative arrangement of the saws. Fig. 6 is a section of thevalve in a plane at a right angle to the sectional view of Fig. 4.

Corresponding and like parts are referred to in the followingdescription and indicated in alL the views of the drawings by the samereference characters. 1

The framework for supporting the operating parts may be of any suitableconstruction and comprises uprights 1,.lo-ngitudinal beams 2, andcross-beams .3, the latter provided with hearings 4, in which the sawmandrels or arbors are journaled. The-carriage 5 for carrying the log 6to be cut into planks, rafters, and the like may be of anyconstructioncommonly employed in woodworking machinery of this class, said carriagebeing adapted to be run backward and forward the length of the log, soas to feed the work to the saws.

In accordance with this invention two sets of saws are provided andarranged to cut in opposite directions and mounted to admit of one setbeing thrown into working position simultaneously with the throwing ofthe other setout of action. This operation takes place at the end of thetravel of the carriage 5 in each direction, so that on the return travelof the carriage the saw previously inactive operates upon the log andthe saw previously cutting is thrown out of action. The saws or cuttersmaybe of any type commonly employed for cutting logs into planks,joists, or other parts. As shown, each set of saws is composed of upperand lower circular saws, the upper saw 7 being smaller or of lessdiameter than the lower saw 8 and both saws 7 and 8 being arranged withtheir cutting edges in a perpendicular line, as indicated at a a, inFig. 5. The points of the teeth of the saws 7 touch a horizontal lineindicated at b b in Fig. 5, Whereas the points of the teeth of the saws8 touch a horizontal line indicated at c c in Fig. 5, the line b I)being below the line 0 c. The cutting edges of the upper and lower sawsoverlap, this being necessary in order to provide a clean and throughout of the timber. By having the saws 7 of less diameter than the saws 8and set forward thereof the cutting edges are adapted to overlap in themanner and for the purpose stated.

The saw mandrels or arbors are indicated at A, B, C, and D and are ofsimilar construction, each being composed of slidable or telescopicparts so related as to admit of driving the saws and at the same timepermitting of one set of saws being advanced and the other setretracted. Each sawmandrel is composed of the parts 9 and 10, the p art9 being journaled in the bearings 4 and the part 10 being arranged totelescope with the part 9 and having the respective circular saw securedto its outer end in any well-known manner. The part 9 is tubular and thepart too as to rotate with the part 9 while free to slide rectilinearlywith reference thereto. Each part 10 is rotatably mounted at its outerend in a cross-head 11, mounted in ways or guides 12. The cross-headscorresponding to the saws of each set are connected, by means of a glandor yoke 13, for simultaneous movement, so as to insure a like andsynchronous movement of the saws 7 and 8, which is essential to theproper working of the machine. Any means may be employed to efiect ashifting of the saws, so as to throw one set into operative position andthe other set out of action, and for convenience the instrumentalitiesillustrated have been employed and will be described in detailhereinafter. The respective fsaw-mandrels are provided with drivers 14,15, 16, and 17, which in the present instance are preferablysprocket-wheels, with which a sprocket-chain 1S cooperates, saidsprocket-chain passing over the driver 14, beneath the driver 15, overthe driver 17, and beneath the driver 16, whereby the mandrelscorresponding to the saws of each set are driven in reverse directions,this being essential to prevent the saws from advancing the work toorapidly or in acting in opposition to the feed, the action of one sawupon the timber being neutralized by the companion saw of the same set.The sprocketchain 18 passes over an idler 19 and beneath acorrespondingidler 20 and receives motion from one of the mandrels whichis extended and provided with a band-pulley 21, to which power isapplied from any suitable engine or motor by means of a drive-belt22 inthe accustomed way.

As hereinbefore intimated, any mechanical means may be employed. forsimultaneous operation of the saws, so as to project one set intoworking position and withdraw the other set out of the way of the plank,slab, or beam being cut from the log. The means illustrated embody acylinder 23, a piston 24, arranged to operate in the cylinder and havingits stem 25 connected to the gland or yoke 13, and a valve mechanism forcontrolling the admission of the motive medium to the cylinders and theexhausting of the same therefrom when its force has been expended. Thevalve mechanism may be of any type or construction so long as it willadmit of the motive medium being utilized so as to reciprocate therespective pistons within their operating-cylinders, the ports beingarranged to cause the pistons to synchronously travel in reversedirections, whereby the saws are simultaneously actuated, the one beingprojected while the other is at the same time retracted. The valveillustrated is of the fourway variety and comprises a casing 26 and avalve-body 27, the latter being formed with passages 28, 29, 30, and 31,intersecting at a common point, as at 32, and adapted to register withpipes 33, 34, 35, and 36, which have connection at opposite ends of therespective cylinders. Curved passages 37 are formed in the valve-body 27and serve to exhaust the spent motive medium from the cylinders, saidpassages being adapted to register with openings 38 in the casing 26.The valve mechanism shown may be substituted by any mechanism ofselected type which will admit of alternately admitting the motivemedium into opposite ends of the respective cylinders opposite to thatreceiving the live agent.

A machine of the character set forth embodying the invention admits of aslab, plank, or section being cut from a log at each travel of thecarriage, the cutting mechanism in operation at one travel of thecarriage being thrown out of operative position and the other cuttingmechanism being thrown into position to operate upon the log upon thereturn movement or travel of the carriage, thereby saving time and aboutdoubling the output of a machine of given capacity.

-I-Iaving thus described the invention, what is claimed as new is 1. Inasawing-machine of the character described, two sets of cuttermechanisms, each comprising a pair of saws, mandrels comprisingtelescopic sections, one of the sections of each mandrel being mountedfor rotation only and the other slidably mounted in the aforesaidsection and adapted to be rotated thereby, yoke connections between theslidable sections of the respective mandrels of each set of saws,whereby same are adapted for simultaneous reciprocation in reversedirections, means for imparting rotary movement to the non-reciprocatingsections of the mandrels consisting of sprocket-wheels rigidly securedto said sections, upper and lower idlers, and a sprocket chain passingover the sprocket-wheel of the upper mandrel-section of one set of sawsunder the corresponding wheel of the upper section of the other set,over the upper and under the lower idlers and over and under the lowersprocket-wheels of the lower mandrel-sections, respectively, whereby themandrels corresponding to the saws of each set are driven in reversedirections, power being applied to one of the mandrels in any suitablemanner, substantially as described.

2. In a machine of the character described, two pairs of circular saws,telescopic mandrels therefor, slidably-mounted cross-heads constitutingbearings for the sections of the mandrels carrying the saws, yokesconnecting corresponding cross-heads, means for imparting rotarymovement to the saw-mandrel sections mounted for rotation only, andactuating mechanism for simultaneously reciprocating the yokes inreverse directions, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS M. DUNAGAN, JR.

